受激布里渊光时域测试系统性能标定实验研究

Experimental characterization of a stimulated brillouin optical-time domain analyzer system

分布式光纤传感技术因其兼备局部应变/温度测试和整体大范围分布测试的突出优点,已经成为工程结构监测领域最具发展前景的传感技术之一。基于受激布里渊散射的光时域分析系统(BOTDA)在测量精度、测量范围以及空间分辨率上均优于其他的分布式光纤传感器。Foresight TM系列光纤分布式应变和温度传感系统(DSTS)是最近推出的商用BOTDA之一,在简要介绍其测试原理和系统组成的基础上,设计了一系列实验对DSTS的各项基本性能参数进行标定,确定了系统的重复性、温度和应变测试性能。针对不同种类的光纤,提供了温敏系数和应变系数,为该系统在工程结构监测中的应用奠定基础。

Due to the excellent capability to measure the local strain and temperature in a large distance,the distributed optical fiber sensing has been one of the most promising sensing techniques in the fields of structural health monitoring.The Brillouin Optical-Time Domain Analyzer（BOTDA） based on simulated Brillouin scattering performs better on the measuring accuracy,measuring range and spatial resolution than the other distributed fiber sensors.The distributed strain and temperature sensor（DSTS,Foresight TM serial） is one of the latest commercial distributed optical fiber sensing systems.Following a brief introduction of the sensing mechanism and the system configuration of DSTS,a series of lab experiments are designed to characterize the basic performance of this system,including the repeatability,the measuring capability of temperature and strain.Regarding different optical fibers,the sensitivity coefficients of temperature and strain are determined as well,which provides a helpful reference for the application of DSTS in engineering practice.